[zepto]

It doesn’t seem like a problem at all. You seem to be just saying that without explaining it.

The communication is not being done using software that Apple provides.

People have a vast array of choices for communications and Apple isn’t harming that.

In addition, there is nothing preventing Google or Facebook from executing on what Apple does other than their own lack of focus.

[makomk]

It's being done using devices that only run software approved by Apple, and Apple already uses that power to dictate what communications are allowed. By their mandate, apps like Discord and Telegram are forced to hard-block users on iOS from joining or viewing servers and communities with adult content, and for some communities with a more, ah, relaxed attitude to sex this fundamentally affects how they communicate with their friends. It doesn't matter what communications software they use because the mandate comes from Apple and every single competing option is required to impose the same restrictions. Arguably this restriction is going to shape how our culture thinks in the long term too.